干旱

The assemblage is characterized by the flourishing of Cyatheaceae, Cheirolepidiaceae and by the appearance of number of parent plants of Callialasporites, suggesting that the Upper Xietan Formation would have been formed in a warm and quite dry environment.

这个组合以桫椤科、掌鳞杉科植物的繁盛，和出现大量Callialasporites母体植物为特点，暗示泄滩组上部形成于炎热而干旱的气候环境。

The changeable regularity and adaptation in different stages of photosynthetic rate, stoma conductance and intercellular CO2 concentration of Cynanchum komarovii that was planted in PVC tube were studied under water stress.

采用PVC管种植模拟土壤干旱的方法，研究了牛心朴子在水分胁迫下光合速率、气孔导度、胞间CO2浓度、叶绿素荧光的变化规律及不同生育期适应性表现。

And meanwhile, the result show that, stomatal restriction was the main factor of the net photosynthetic rate's decrease in the leaves of 4 Dactylis glomerata L. when stress in slight water stress and the non-stomatal restriction was the main factor of the net photosynthetic rate in the leaves of 4 Dactylis glomerata L.

盆栽控水条件下4份鸭茅光合作用机理的研究表明，随着干旱胁迫程度的加强，4份鸭茅种质的净光合速率、蒸腾速率、气孔导度及叶绿素含量均有较大幅度的降低，其中抗旱性强的ZXY04P-201下降的速度慢，幅度小，而抗旱性差的ZXY04P-239下降速度快，幅度大。

The comprehensive evalucation resulted in a strong drought resistance group including ZXY04P-201、ZXY03P-227、ZXY03P-122 and ZX Y04P-136, a weak drought resistance group including ZXY04P-101、ZXY04P-89,ZXY04P-239 and a intermediate group including the others according to the the above indicators. 3. The results of study on drought mechanism for 4 Dactylis glomerata L. under continuously water stress and rewatering show: the water saturation deficit of leaves arose hastily, and ZXY04P-239 changed most obviously while ZXY04P-201 changed only slightly under drought stress. ZXY03P-173 and ZXY04P-201 increased in the relative plasmalemma permeability and the soluble sugar content while thant of ZXY04P-75 and ZXY04P-239 showed the trend of initial increasing, reaching the peak at the 8th day, then decreasing under drought stress.

20份鸭茅种质幼苗期抗旱性研究表明，干旱胁迫条件下，所有材料的株高、生物量显著下降，叶片脯氨酸和可溶性糖作为重要的渗透调节物质，其含量迅速增加，质膜相对透性的数值变大，细胞膜受伤害程度增大，水分饱和亏缺值变大，植物保水能力变弱，胞间CO2浓度增大；净光合速率、蒸腾速率、气孔导度和叶绿素含量等指标测定值减小，通过20份鸭茅种质苗期抗旱性综合评价，发现ZXY04P-201、ZXY03P-227、ZXY03P-122、ZXY04P-136属强抗旱性材料，ZXY04P-101、ZXY04P-89、ZXY04P-239属弱抗旱性材料，其他属于中等抗旱性材料。

Decadal variations of arid and semiarid boundary in China during last 100 years have been analyzed by using Thornthwaite's method.

利用Thornthwaite的干湿分类函数，对近100年中国干旱和半干旱区界限的10年际变动特征进行了分析。

In extremely arid condition, the survival rate curve of annual plants presents a Deevey Ⅲ type , while in relatively humid condition, the survival rate curve has a medial distribution type.

一年生草本植物的存活曲线在特别干旱条件下完全表现为DeeveyⅢ型，但在降水相对充足的情况下，存活曲线表现为中间类型。

This erosion, coupled with a seven-year drought that began in 19 31 , turned once fertile grasslands into a desertlike region known as the Dust Bowl.

这侵蚀，再加上7年的干旱， 19月31日开始，把肥沃的草原一旦进入desertlike区域称为沙尘暴。

A total of 16 pairs of digenic interactions were detected including 4 pairs under drought stress with a total contribution of 18.57% and 12 pairs under normal conditions that accounted for 38.49% of the total.

检测到显著互作效应位点16对：其中干旱处理下有4对显著互作，联合贡献率为18.57%；正常供水下有12对显著互作，联合贡献率达38.49%。

The death of Dipterocarpaceae seedlings is closely linked to the drought and greatly increased by the vertebrate herbivory, but only a high proportion of foliar herbivory caused by insect could result in the death of seedlings, especially small individuals.

引起龙脑香科植物幼苗死亡的主要原因是干旱；脊椎动物捕食增加龙脑香科植物幼苗的死亡，昆虫对幼苗叶片捕食造成的死亡只发生在叶片大量损失或幼苗较小的情况下。

The death of Dipterocarpaceae seedlings is closely linked to the drought and greatly increased by the vertebrate herbivory, but only a high proportion of foliar herbivory caused by insects could result in the death of seedlings, especially small individuals.

引起龙脑香科植物幼苗死亡的主要原因是干旱；脊椎动物捕食增加龙脑香科植物幼苗的死亡，昆虫对幼苗叶片捕食造成的死亡只发生在叶片大量损失或幼苗较小的情况下。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。